2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
9/25/2018 | 9:30 AM - 9:45 AM | Factors Driving Greater Sage-Grouse Trends in the Eastern Portion of their Range: Anthropogenic, Fire, Habitat, Hunting, Ravens, and Weather | Eccles Conference Center Auditorium
Factors Driving Greater Sage-Grouse Trends in the Eastern Portion of their Range: Anthropogenic, Fire, Habitat, Hunting, Ravens, and Weather
Degradation of sagebrush (Artemisia spp.) habitat has occurred throughout the range of greater sage-grouse (Centrocercus urophasianus; hereafter “sage-grouse”). Areas with greater loss of sagebrush habitat are avoided by sage-grouse and congruent with lower demographic rates and lek extirpation. We evaluated the effects of habitat and potential predation, including anthropogenic, fire, habitat, hunting regulations, weather, and common raven (Corvus corax; hereafter “raven”) numbers, on lek trends of sage-grouse populations in the Powder River and Wyoming Basins from 1995–2014. Instantaneous growth rate (r) was positively associated with precipitation and negatively with hunting season length in the Powder River Basin population, and r was positively associated with precipitation but negatively with raven numbers for the Wyoming Basin population. Oil and gas well density was negatively associated with initial lek counts and time-varying carrying capacity (K) for both populations. In addition, the Powder River Basin population had a negative association of human density with K, and the Wyoming Basin population had negative associations with tree proportion and major road density on initial lek count and major road density and fire, tree, and cropland proportions on K. Our results expand knowledge on how spatiotemporal factors related to initial lek count, r, and K influence sage-grouse populations. However, we could not discern whether longer hunting seasons in the Powder River Basin were associated with lower r or collinear with general trend or another factor (e.g., West Nile virus could also explain lower r rather than hunting), because spatial variability in hunting exposure could not be designated.
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Presenters/Authors
Jonathan Dinkins
(), jonathan.dinkins@oregonstate.edu;
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Jeffrey Beck
(), University of Wyoming, jlbeck@uwyo.edu;
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Kirstie Lawson
(), kirstie.lawson09@gmail.com;
Biology Department
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